Tricycle frame



FIG. 1 is a perspective view of a tricycle frame showing our new design;

FIG. 2 is a front elevational view of a thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a top plan view thereof.

The ornamental design for a tricycle frame, as shown.